When you add a domain to DreamHost up to 5 resources will be available at yourdomain.com.
A webmail client is automatically set up on all domains at http://webmail.yourdomain.com. Dreamhost currently uses the PHP-based Webmail software package SquirrelMail.
The Mailbox Manager at http://mailboxes.yourdomain.com gives your users the ability to check their disk usage, set up keyword filters and auto-responders, etc. without giving them access to the full control panel. Each user can just change the settings for their own email account.
Every domain hosted at DreamHost will have the open-source website statistics software package Analog available at http://www.yourdomain.com/stats/. Analog is one of the most widely-used logfile analyser in the World.
CPU Usage Monitor
You can track how many resources your website is taking up at http://www.yourdomain.com/stats/resources/. All customers are only allowed a certain number of CPU minutes per day, so it’s a good idea to keep an eye on your CPU usages.
MySQL Database Manager
phpMyAdmin is installed by default for all MySQL databases. So if you have set up a database at the hostname mysql.yourdomain.com you will have the phpMyAdmin web-based interface available at http://mysql.yourdomain.com. Since you choose the MySQL hostname yourself, the URL of phpMyAdmin can change from user to user, but the most common choice seems to be http://mysql.yourdomain.com.